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Jon Hamm's Friendship With Daniel Radcliffe

The actor has words for his "A Young Doctor's Notebook" costar. How do they keep in touch? Hint: it's a popular iPhone game! Find out which one.

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Your information may be shared with other NBCUniversal businesses and used to better tailor our services and advertising to you. For more details about how we use your information, see our Privacy Policy. If you are located outside of the U.S., your information may be transferred to, processed and used in the U.S.